Let air circulate but keep it water tight?

[jago25_98]

Is this the opposite of an air lock?

I want to make a bag/membrane/lock device that can carry water, yet keep it aerated.

Obviously a cup does this, but I need it to be able to move about vigorously without spilling.

Any ideas what this is called?

 

[xxChrisxx]

A cup with a lid.

 

[jago25_98]

Doh!

I mean fresh air (Oxygen) into the watertight container! (not recirculated)

 

[SonyAD]

Just use a straw to blow air into it from time to time...

 

[Filip Larsen]

You could perhaps place a small check valve in the air supply inlet. Depending on how much water the container holds and how it moves during acceleration you may be able to find a check pressure that will allow air to enter with a minimum of over-pressure which then could be supplied by a small pump, your lungs (as suggested), or perhaps by the movement of the container itself.

 

[MATLABdude]

Gore-Tex? Unfortunately, depending on the contents, the pores may clog up.
http://en.wikipedia.org/wiki/Gore-Tex